Geochemical properties of shells of Arctica islandica (Bivalvia): implications for environmental and climatic change

• Other Authors: Zhang, Zengjie
• Language: English
• Published: Niedersächsische Staats- und Universitätsbibliothek 2009
• Subjects: 550; 16,13; geo ggo; Arctica islandica; Iceland
• Online Access: http://publikationen.ub.uni-frankfurt.de/volltexte/2010/7529; http://d-nb.info/1000665577/34; http://nbn-resolving.de/urn:nbn:de:hebis:30-75290

Trace elemental concentrations of bivalve shells content a wealthy of environmental and climatic information of the past, and therefore the studies of trace elemental distributions in bivalve shells gained increasing interest lately. However, after more than half century of research, most of the trace elemental variations are still not well understood and trace elemental proxies are far from being routinely applicable. This dissertation focuses on a better understanding of the trace elemental chemistry of Arctica islandica shells from Iceland, and paving the way for the application of the trace elemental proxies to reconstruct the environmental and climatic changes. Traits of trace elemental concentrations on A. islandica shells were explored and evaluated. Then based the geochemical traits of the shells, four non-environmental/climatic controlling is indentified. (1) Trace elemental concentrations of bivalve shells are effected by early diagenesis by the leach or exchange of elemental ions, especially in shell tip part, even with the protection of periostrucum; (2) The analytical methods also affect the results of trace elemental concentrations, especially for the element, such as Mg, which is highly enriched in organic matrices; (3) Shell organic matrices are found play a dominating role on the concentration of trace elements on A. islandica shells. Most trace elements only occurred in insoluble organic matrices (IOM), although others are only found in the carbonate fraction. Univ., Diss.--Frankfurt (Main), 2010 Online edition [2010] Online-Ausg. |2010||||||||||